what's

剑桥词典

short form of what is or what has
（what is 或 what has 的縮略形式）
What's (= what is) that stuff on your forehead ? 你前額上的是什麽東西？
They want a list of what's (= what has) been stolen . 他們想要一個失竊物品的清單。 返回 what's